mclaughlin



linttd gitano @anni @Witte Letters Patent No. 104,178,11ated June 14, 1870.

STEAM-BOILER BLOW-OFF PIPE.' v

The Schedule referred to in these Letters Patent and making part of the same.

lo all whom It-may concern Be it known that I, JOHN C. MQLAUGHLIN, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Iniprovement in Steam-boiler Blow-o Pipe; and I'do hereby declare that the following is a full, clear, and `enact description thereof, which will enable others skilled in the art to make and use the same, referencebeing had to the accompanying drawing forming part oi'ithis specification. The object of this invention is to provide etIic-ieut means for clearing the bottoms or interiorlower surface of steam-boilers of scale and sediment, thereby preventing such boilers from being damaged by the tire; and Y It consists in a blow-ofi' pipe, supported in the boiler, in any suitable manner, a short distance above bottom, or above the ire-furnace of the boiler, with au open end curved toward the bottom, and with one or more branch-pipes attached thereto, and discharging through the mud-box, as hereinafter more lfully described.

In the accompanying drawing- Figure l represents a vertical cross-section of Iig. 2, on thelinex x.. v

Figure f2 is a longitudinal horizontal-section of fig. l, `on the line y y.

Similar letters ofI reference indicate corresponding parts.

A is the boiler.

B is the mnd-box, attached to the back end of the boiler by the vertical pipe G.

D is the'blow-oti cock.

. E is the interiorblow-oi pipe, which passes from the boiler down into and through the mud-box to the cock D, as seen in the drawing.

F is the curved open end.

G G represent branches 'pointing downward.

H is a support, which raises the pipe above the bottom, as seen in fig. '1.

scale is started from the bottom, and blown out;

through the pipe when the blow-ott` cock is opened.

Being a practical engineer of large experience on western rivers, where sediment is deposited and formed into scale to a greater extent than at the east, I have tried various means, with a View of finding a remedy, as the scale on the bottom is the cause of more damage and destruction to boilers than all other causes combined.

My blow-off pipe is made large, so that a strong current is suddenly started. moving the pressure from the scale directly over the hottest portionot the boiler, whe1je the' scale forms in greatest quantity, the heat and the'relief from pressue canse the scale to start or become loosened from the irouat once, thus preventing the possibility oi' damage being caused thereby, if the boiler is blown off at suitable intervals.

I do not claim, broadly, a blow-oli pipe inside a steam-boiler, as I am aware that such pipes have been used before, but none that I have seen have' been properly arranged, and they have, consequently, failed of producing the desired eiiect, that is, loosening the scale directly over the ire.

Having thus described my'invention,

I claim as new and desire to secure by Letters lat eut- In combination l with a steam-boiler, the blow-oli" pipe E, when the same is constructed and. arrranged therein substantially as shown and described, and for the purposes set forth.

JOHN C. MCLAUGHLIN. Witnesses:

E. P. BLACK, ISAAC BLACK, AND. HUMBERT.

By thus suddenly re- 

